Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 428, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2022.113858
Keywords
Copper; Strontium; TiO2 nanotube; Photodegradation
Categories
Funding
- Ministry of Education [IF-2020-019-BASRC]
- Imam Abdulrahman Bin Faisal University, Basic and Applied Scientific Research Center
- Deputyship for Research & Innovation, Saudi Arabia [DSR-2019-087 Sci]
- [(DSR-2019-087 Sci)]
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In this study, the influence of adding strontium to Cu-doped TiO2 nanotubes on the photocatalytic performance was investigated. The results showed that adding strontium within a certain range resulted in the formation of Sr-O-Ti entities on the surface of the nanotubes, leading to an enhanced photocatalytic response.
The influence of adding strontium to Cu-doped TiO2 nanotubes on the photocatalytic performance of the resulting materials was herein studied considering changes in structural, textural, optical and morphological properties. Addition of strontium was performed in a 0.2-1.0 wt% range while an optimized fixed Cu loading of 0.5 wt% was used. TiO2 nanotubes were obtained using alkaline hydrothermal treatment of P25 followed by a calcination treatment at 400 degrees C. The resulting TiNT material was then impregnated with copper using an incipient wetness impregnation followed by a new calcination at 400 degrees C (0.5Cu-TiNT). Strontium was then added under similar impregnation-calcination conditions. The effect of adding various amounts onto 0.5Cu-TiNT was therefore deeply characterized using X-ray diffraction, N2 adsorption-desorption measurements, scanning electron microscopy coupled with energy-dispersive X-ray analysis, Raman, UV-vis diffuse reflectance, X-ray photoelectron, and photoluminescence spectroscopies as well as determining dielectric properties. Results clearly emphasize that up to a Sr loading of 0.8 wt%, the addition of Sr results in in situ formation of Sr-O-Ti entities on the surface of 0.5Cu-TiNT. Above this threshold loading, excess Sr loading leads to the formation of segregated SrO species. Finally, a direct correlation was observed here between the optimized formation of surface Sr-O-Ti entities and an enhanced photocatalytic response due to improved stabilization of photogenerated charges on 0.5Cu-TiNT resulting from the ferroelectric interference of neighboring SrTiO3 entities.
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